I believe the weight limit for the commercial stuff is 1kg.
And to be honest I've done a whole lot of googling and researching around and there are very few shops that carry branded items that we hear aboutall over this forum.
Most of the shisha products are in middle eastern bakerys or meatshops that sell tobacco straight out of ziplock bags.
I know the hookah smoking market is quite large in Canada, just don't know why any entrepreneur hasn't jumped on the opportunity

edit: I also don't believe theres a online canadian hookah vendor either, that would solve all our problems =D

The reason is because the tax on Shisha is VERY high ($30 tax / $10 shisha). Shops that sell shisha legally have to sell it for around $60 - $80 / 250g box of Nakhla.